Issues With Game In Hd

ok i just got a used hdtv so i set my modded xbox with xbmc to 1080i, and now my fable game will start up but and it looks like the hdav cables are hocked up wrong but its only that game and my emulators. so how do i fix it im not as worried about the emulators as im sure ill find some that suport hd but how do i get fable to work